The word blog is a combination of the words "Web and Log."
Blogs are as diverse as the internet using population itself but usually provide some type of commentary or analysis on various subjects ranging from politics to a personal diary. The format of blogs are very important. The interface allows for text and images, as well as links to other web sites related to the subject. This allows for an indepth look at a subject with only a few clicks of the mouse. For example, you can support an argument visually through the use of imbedded video. Furthermore, readers on most blogs are given permission to comment in an interactive format which is visible by all subsequent readers. This lends a sense of community to many blogs and promotes the idea of web 2.0. The word "blog" has also evolved into a verb, referring to the actual act of adding content or creating content for web logs.
"In May 2007, blog search engine Technorati was tracking more than 71 million blogs."
- http://justtv.wordpress.com/ Professor Jason Mittell's Blog, "Just TV"